If you are truly interested in peds path, I recommend you aim for the top programs-Boston Childrens Hospital or Childrens Hospital of Philadelphia. Peds path is such a small academic field so where you train for peds path is important but not the end of the world if you dont get into those two programs. These two programs are outstanding for pediatric surgical pathology. You want to go to a busy pediatric pathology program where you will see a lot of surgpath. Also, WHO you know is important.
Having said that, from the places you listed, Northwestern Lurie Children's Hospital has a big name in pediatric pathology in Elizabeth Perlman. All the neuroblastoma cases get sent in from across the country to her.
In regards to your California programs, Shimada (another big name who created the classification system for neuroblastoma) is at LA Childrens Hospital (USC), so you can always do a rotation there since you would be nearby. LA Childrens (associated with USC) has a well regarded pediatric pathology program as well.
I dont know much about Baylor but you can do rotations at Texas Childrens Hospital.
I guess it really depends where you can see yourself for the next four years (fit with residents, attendings and the residency culture being MOST IMPORTANT, although weather for me is important as well)
Pediatric pathology is not a competitive field to get a fellowship in, except for the top programs I mentioned. There are many unfilled programs each year. The job market is good in peds path as well.